In my experience, this problem is generally caused by someone "picking up" Perl as they go along, rather than actually reading a book, or taking a class, or anything "formal". They simply think that by commenting out the command, since the errors aren't reported, they don't exist.
Far too many programmers are falling into this type of bad programming, either from their own want to take shortcuts, or by pressures put on them by management to maintain code in languages they aren't trained in. In either case, the programmer needs to be made aware of the consequences and shown the "light". Generally speaking, once they are aware, they conform. If they don't, then that's another situation entirely.
If you give a man a fish he will eat for a day.
If you teach a man to fish he will buy an ugly hat.
If you talk about fish to a starving man, you're a consultant.
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